Faculty of Science , K N Govt  College Gyanpur  S R N Bhadohi (India)

Measurement of dielectric constant (K^') and loss (K^") of light rare-earth nickelates of the type RNiO₃ with R = La, Ce, Pr, Ne, Sm and Eu have been reported in temperature range 300-1200 K. All the materials have been prepared in the laboratory by solid state reaction technique and characterised by XRD. Studied materials have high value of K^' and low value of K^" at lower temperature. However, at higher temperature increase becomes much faster and is due to space charge effect of thermally generated charge carriers. Temperature T₁ is different for different materials.